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vbsc 421 exam 1 lecture 8.
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vbsc 421 exam 1 lecture 8Supporting processes of fins (2) - ANS-1) Pterygiophore
2) dermal fin rays
pterygiophores - ANS-basal (proximal) and radials(middle)
dermal fin rays (3) - ANS-ceratotrichia (keratin)- elasmobranch
Lepidotrichia (ossified)- boney fishes
Actinotrichia (keratin)- support leidotrichia
Chiridium - - ANS-Limb
3 regions of Limbs - ANS--stylopodium, zeugopodium, autopodium
Basal chordates lack ____ homologous to those of vertebrates - ANS-appendages
Paired appendages first appear in ___ or ____ jawless fishes - ANS-Ordivian or Silurian
in gnathostomes, __ sets of paired appendages evolved in parallel - ANS-2 sets-
pectoral and pelvic
Phylogeny: Ostracoderms - ANS-Unpaired medial, anal and dorsal fins
- rudimentary paired pectoral fins
Placoderms - ANS-pectoral and pelvic girdles, fins
- SINGLE pelvic endoskeletal element
Chondrichthyans - ANS-Primitive sharks and modern elasmobranches
Scapulocoracoid bar - ANS-pectoral girdle
Pubioishiac bar - ANS-pelvic girdle
Actinopterygians- pectoral region; main element - ANS-Cleithrum main element->meets
supracleithrum dorsally
-posttemporal portion attaches pectoral girdle to skull
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